Handle correct precision on net values

.changeset/itchy-baths-cross.md

@@ -0,0 +1,5 @@
+---
+'@epilot/pricing': patch
+---
+
+Handle correct precision on net unit amount values

src/variables/utils.test.ts

@@ -2,7 +2,7 @@ import { describe, it, expect, beforeEach, vi } from 'vitest';
 import { fixedDiscountCoupon } from '../coupons/__tests__/coupon.fixtures';
 import type { I18n } from '../shared/types';
 import type { PriceItemWithParent } from './types';
-import { getUnitAmount } from './utils';
+import { getDecimalPrecision, getUnitAmount } from './utils';
 
 const mockI18n = {
   t: (key: string, fallback: string) => key || fallback,
@@ -48,3 +48,29 @@ describe('getUnitAmount', () => {
     expect(grossAmount).toBe('789,46\xa0€');
   });
 });
+
+describe('getDecimalPrecision', () => {
+  it('returns 2 when input is undefined', () => {
+    expect(getDecimalPrecision(undefined)).toBe(2);
+  });
+
+  it('returns 2 when input has no decimal point', () => {
+    expect(getDecimalPrecision('12')).toBe(2);
+  });
+
+  it('returns 2 for a two-decimal string', () => {
+    expect(getDecimalPrecision('12.00')).toBe(2);
+  });
+
+  it('returns 1 for a one-decimal string', () => {
+    expect(getDecimalPrecision('12.5')).toBe(1);
+  });
+
+  it('returns the full precision for a high-precision string', () => {
+    expect(getDecimalPrecision('0.12345')).toBe(5);
+  });
+
+  it('returns the full precision for a high-precision string', () => {
+    expect(getDecimalPrecision('10.12345')).toBe(5);
+  });
+});

src/variables/utils.ts

@@ -207,6 +207,11 @@ export const getUnitAmount = (
   });
 };
 
+export const getDecimalPrecision = (unitAmountDecimal?: string): number => {
+  const dotIndex = unitAmountDecimal?.indexOf('.');
+  return unitAmountDecimal && dotIndex !== undefined && dotIndex !== -1 ? unitAmountDecimal.length - dotIndex - 1 : 2;
+};
+
 const getTieredUnitAmount = (
   item: PriceItemWithParent,
   i18n: I18n,
@@ -248,6 +253,8 @@ const getTieredUnitAmount = (
     item._price.pricing_model as PricingModel,
   );
 
+  const netPrecision = useUnitAmountNet ? getDecimalPrecision(displayableTier?.unit_amount_decimal) : undefined;
+
   const descriptionUnit = '';
   const descriptionCurrency = item.currency as Currency;
   const descriptionTranslationFactory = (key: string) => i18n.t(`table_order.${key}`);
@@ -265,7 +272,7 @@ const getTieredUnitAmount = (
         language,
         descriptionCurrency,
         descriptionTranslationFactory,
-        { showStartsAt: false, enableSubunitDisplay: true },
+        { showStartsAt: false, enableSubunitDisplay: true, precision: netPrecision },
         tax,
       )?.split('/')[0]; // remove the unit part as it is not needed
     }
@@ -278,7 +285,12 @@ const getTieredUnitAmount = (
         language,
         descriptionCurrency,
         descriptionTranslationFactory,
-        { showStartsAt: false, showOnRequest: !isUnitAmountApproved, enableSubunitDisplay: true },
+        {
+          showStartsAt: false,
+          showOnRequest: !isUnitAmountApproved,
+          enableSubunitDisplay: true,
+          precision: netPrecision,
+        },
         tax,
       )?.split('/')[0]; // remove the unit part as it is not needed
     }
@@ -291,7 +303,7 @@ const getTieredUnitAmount = (
         language,
         descriptionCurrency,
         descriptionTranslationFactory,
-        { showStartsAt: false, enableSubunitDisplay: true },
+        { showStartsAt: false, enableSubunitDisplay: true, precision: netPrecision },
         tax,
       )?.split('/')[0]; // remove the unit part as it is not needed
     }